Solution:In theatre, a convention is an agreement between the actor and the spectator to use artificial means of creating actions. Conventions are the techniques and methods employed by actors and directors to convey the story, emotions, and actions in a play, which the audience accepts as part of the performance's reality. A corner is unrelated to this context. Constructivism is a 20th-century architectural and artistic movement that is not specific to theatre conventions.
A console is a control panel or a storage compartment, irrelevant to theatrical conventions. Therefore, the convention is the correct term for this mutual understanding in theatre.